static string ItemToString(ProductionItem item, bool doLA)
{
int lhsLength;
List <string> list = new List <string>();
System.Text.StringBuilder builder = new System.Text.StringBuilder();
builder.AppendFormat("{0} {1}: ", item.production.num, item.production.lhs);
lhsLength = builder.Length;
for (int i = 0; i < item.production.rhs.Count; i++)
{
if (i == item.pos)
{
list.Add(".");
}
list.Add(item.production.rhs[i].ToString());
}
if (item.pos == item.production.rhs.Count)
{
list.Add(".");
}
builder.Append(ListUtilities.GetStringFromList(list, " ", lhsLength + 6));
if (item.LA != null && doLA)
{
builder.AppendLine();
builder.AppendFormat("\t-lookahead: {{ {0} }}", ListUtilities.GetStringFromList(item.LA, ", ", 16));
}
return(builder.ToString());
}
private void AddKernel(Production production, int pos)
{
ProductionItem item = new ProductionItem(production, pos);
kernelItems.Add(item);
allItems.Add(item);
}
private void AddNonKernel(Production production)
{
ProductionItem item = new ProductionItem(production, 0);
if (!allItems.Contains(item))
{
allItems.Add(item);
AddClosure(item);
}
}
private AutomatonState FindExistingState(Symbol sym, List <ProductionItem> itemSet)
{
if (accessedBy.ContainsKey(sym))
{
foreach (AutomatonState state in accessedBy[sym])
{
if (ProductionItem.SameProductions(state.kernelItems, itemSet))
{
return(state);
}
}
}
return(null);
}
private void AddClosure(ProductionItem item)
{
if (item.pos < item.production.rhs.Count)
{
NonTerminal nonTerm = null;
Symbol rhs = item.production.rhs[item.pos];
if ((nonTerm = rhs as NonTerminal) != null)
{
foreach (Production p in nonTerm.productions)
{
AddNonKernel(p);
}
}
}
}
public override bool Equals(object obj)
{
ProductionItem item = (ProductionItem)obj;
return(item.pos == pos && item.production == production);
}
